Answer:

Step-by-step explanation:
Given :

Now,

Therefore, expression is equivalent to 
By setting up a system of equations we can easily solve this problem. Let's denote Jane's working hours with x and Jack's working hours with y. Since they don't want to work more than 65 hours, the first equation is x+y=65. The second equation is 14x+7y=770. By solving this system of equation

, we find that y=20 hours, which is Jack's maximum working hours.
Answer:
4 1/2
Step-by-step explanation:
3/4 divided by 1/6 turns into 3/4 divided by 6/1, but then you multiply instead so its 3/4 x 6/1 = 4/12
Answer:
-10-(-6) = -10+6 = -4; A
Step-by-step explanation:
Answer:
(3,12)
Step-by-step explanation:
you would put the 12 as y then 3×3=9+6=15 and 12 doesn't equal 15